<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#">全部</a>
                </li>
                <li v-for="(item, index) in subjectNestedList" :key="index" :class="{active:oneIndex==index}">
                  <a :title="item.title" href="#" @click="searchOne(item.id, index)">{{ item.title }}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(item, index) in subSubjectList" :key="index" :class="{active:twoIndex==index}">
                  <a :title="item.title" href="#" @click="searchTwo(item.id, index)">{{ item.title }}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{ 'current bg-orange': buyCountSort != '' }">
                <a
                  title="销量"
                  href="javascript:void(0);"
                  @click="searchBuyCount()"
                >销量
                  <span :class="{ hide: buyCountSort == '' }">↓</span>
                </a>
              </li>
              <li :class="{ 'current bg-orange': gmtCreateSort != '' }">
                <a
                  title="最新"
                  href="javascript:void(0);"
                  @click="searchGmtCreate()"
                >最新
                  <span :class="{ hide: gmtCreateSort == '' }">↓</span>
                </a>
              </li>
              <li :class="{ 'current bg-orange': priceSort != '' }">
                <a
                  title="价格"
                  href="javascript:void(0);"
                  @click="searchPrice()"
                >价格&nbsp;
                  <span :class="{ hide: priceSort == '' }">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total==0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list" v-if="data.total>0">
            <ul class="of" id="bna">
              <li v-for="item in data.items" v-bind:key="item.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="item.cover" class="img-responsive" alt="听力口语">
                    <div class="cc-mask">
                      <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/'+item.id" :title="item.title"
                       class="course-title fsize18 c-333">{{ item.title }}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                              <span class="fr jgTag bg-green" v-if="Number(item.price) === 0">
                                  <i class="c-fff fsize12 f-fA">免费</i>
                              </span>
                    <span class="fl jgAttr c-ccc f-fA">
                                  <i class="c-999 f-fA">{{ item.viewCount }}人学习</i>
                                  |
                                  <i class="c-999 f-fA">9634评论</i>
                              </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a :class="{undisable: !data.hasPrevious}"
               @click.prevent="gotoPage(1)" href="#" title="首页">首</a>
            <a :class="{undisable: !data.hasPrevious}"
               @click.prevent="gotoPage(data.current-1)" href="#" title="前一页">&lt;</a>
            <a v-for="page in data.pages" v-bind:key="page"
               :class="{current: data.current == page, undisable: data.current == page}"
               @click.prevent="gotoPage(page)" href="#" :title="'第'+page+'页'">{{ page }}</a>
            <a :class="{undisable: !data.hasNext}"
               @click.prevent="gotoPage(data.current+1)" href="#" title="后一页">&gt;</a>
            <a :class="{undisable: !data.hasNext}"
               @click.prevent="gotoPage(data.pages)" href="#" title="末页">末</a>
            <div class="clear"></div>
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from "@/api/course"

export default {
  data() {
    return {
      page: 1, //当前页
      data: {}, //课程列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort: "",
    }
  },
  created() {
    // 课程第一页查询显示
    this.initCourseFirst()
    // 一级分类显示
    this.initSubject()
  },
  // asyncData({ params, error }) {
  //   return courseApi.getCourseList(1, 8).then(response => {
  //     console.log(response);
  //     return { data: response.data.data }
  //   })
  // },
  methods: {
    // 查询第一页数据
    initCourseFirst() {
      courseApi.getCourseList(1, 8, this.searchObj)
        .then(response => {
          this.data = response.data.data
        })
    },
    // 查询所有一级分类
    initSubject() {
      courseApi.getAllSubject()
        .then(response => {
          this.subjectNestedList = response.data.data.list
        })
    },
    // 分页切换方法
    gotoPage(page) {
      courseApi.getCourseList(page, 8, this.searchObj).then(response => {
        this.data = response.data.data
      })
    },
    // 点击某个一级分类，查询出对应二级分类
    searchOne(subjectParentId, index) {
      // 把传递index值赋值给oneIndex，为了active样式可以生效
      this.oneIndex = index

      this.twoIndex = -1
      this.searchObj.subjectId = ""
      this.subSubjectList = []

      // 把一级分类点击id值，赋值给searchObj
      this.searchObj.subjectParentId = subjectParentId
      // 点击某个一级分类进行条件查询
      this.gotoPage(1)

      // 拿着点击一级分类的id 和 所有的一级分类id进行比较
      // 如果id相同，从一级分类里面获取对应的二级分类
      for (let i = 0; i < this.subjectNestedList.length; i++) {
        // 获取每个一级分类
        let oneSubject = this.subjectNestedList[i]
        // 比较id是否相同
        if (subjectParentId == oneSubject.id) {
          this.subSubjectList = oneSubject.children
        }
      }
    },
    // 点击某个二级分类实现查询
    searchTwo(subjectId, index) {
      // 把index赋值，为了样式能生效
      this.twoIndex = index
      // 向searchObj中赋值
      this.searchObj.subjectId = subjectId
      // 点击某个二级分类进行条件查询
      this.gotoPage(1)
    },
    // 根据销量做排序
    searchBuyCount() {
      // 设置对应变量中的值，为了样式能生效
      this.buyCountSort = "2"
      this.gmtCreateSort = ""
      this.priceSort = ""

      // 把值赋值到searchObj
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort
      this.searchObj.priceSort = this.priceSort
      // 调用方法查询
      this.gotoPage(1)
    },
    // 根据最新时间做排序
    searchGmtCreate() {
      // 设置对应变量中的值，为了样式能生效
      this.buyCountSort = ""
      this.gmtCreateSort = "8"
      this.priceSort = ""

      // 把值赋值到searchObj
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort
      this.searchObj.priceSort = this.priceSort
      // 调用方法查询
      this.gotoPage(1)
    },
    // 根据价格排序
    searchPrice() {
      // 设置对应变量中的值，为了样式能生效
      this.buyCountSort = ""
      this.gmtCreateSort = ""
      this.priceSort = "5"

      // 把值赋值到searchObj
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort
      this.searchObj.priceSort = this.priceSort
      // 调用方法查询
      this.gotoPage(1)
    }
  }
}
</script>

<style scoped>
.active {
  background: #bdbdbd;
}

.hide {
  display: none;
}

.show {
  display: block;
}
</style>
